7is not an example of a) a variable b) an expression c) a constant d) a term

A) a variable

Step-by-step explanation:

A) a variable    a variable changes value  7 does not change

B) an expression    does not have an equal sign  7 does not have an equal sign

C) a constant  7 is constant, it does not change  

D) a term  is a group of numbers and variables with no operators

7 is not an example of a variable.

Step-by-step explanation:

7 is not an example of a variable.  7 is a constant (C), and could be an expression or a term.

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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